6.7 billion yen ($60 million) in cryptocurrency has been stolen by hackers from a Japanese digital exchange called Zaif. Tech Bureau Corp, the Osaka based company that owns the exchange, said hackers gained access for a timeframe of over two hours on September 14 and stole money from Zaif’s ‘hot wallet’ where Bitcoin and other digital currencies are stored, Reuters reported. Server problems were detected on September 17, with the company sounding the alarm to authorities the following day. The exchange was taken offline, and efforts have been underway to get it working again.

Hackers have stolen 6.7 billion yen ($60 million) in Bitcoin and two other cryptocurrencies from the Japanese digital exchange, Zaif, owned by startup Tech Bureau Corp, the company said on Thursday.

In a statement following the hack, Tech Bureau said that its Zaif exchange was hacked in a window of over two hours on September 14. They detected server problems…